WP_Widget_Categories::widget( array $args, array $instance )

45	public function widget( $args, $instance ) {46		static $first_dropdown = true;47 48		$default_title = __( 'Categories' );49		$title         = ! empty( $instance['title'] ) ? $instance['title'] : $default_title;50 51		/** This filter is documented in wp-includes/widgets/class-wp-widget-pages.php */52		$title = apply_filters( 'widget_title', $title, $instance, $this->id_base );53 54		$count        = ! empty( $instance['count'] ) ? '1' : '0';55		$hierarchical = ! empty( $instance['hierarchical'] ) ? '1' : '0';56		$dropdown     = ! empty( $instance['dropdown'] ) ? '1' : '0';57 58		echo $args['before_widget'];59 60		if ( $title ) {61			echo $args['before_title'] . $title . $args['after_title'];62		}63 64		$cat_args = array(65			'orderby'      => 'name',66			'show_count'   => $count,67			'hierarchical' => $hierarchical,68		);69 70		if ( $dropdown ) {71			printf( '<form action="%s" method="get">', esc_url( home_url() ) );72			$dropdown_id    = ( $first_dropdown ) ? 'cat' : "{$this->id_base}-dropdown-{$this->number}";73			$first_dropdown = false;74 75			echo '<label class="screen-reader-text" for="' . esc_attr( $dropdown_id ) . '">' . $title . '</label>';76 77			$cat_args['show_option_none'] = __( 'Select Category' );78			$cat_args['id']               = $dropdown_id;79 80			/**81			 * Filters the arguments for the Categories widget drop-down.82			 *83			 * @since 2.8.084			 * @since 4.9.0 Added the `$instance` parameter.85			 *86			 * @see wp_dropdown_categories()87			 *88			 * @param array $cat_args An array of Categories widget drop-down arguments.89			 * @param array $instance Array of settings for the current widget.90			 */91			wp_dropdown_categories( apply_filters( 'widget_categories_dropdown_args', $cat_args, $instance ) );92 93			echo '</form>';94 95			ob_start();96			?>97 98<script>99(function() {100	var dropdown = document.getElementById( "<?php echo esc_js( $dropdown_id ); ?>" );101	function onCatChange() {102		if ( dropdown.options[ dropdown.selectedIndex ].value > 0 ) {103			dropdown.parentNode.submit();104		}105	}106	dropdown.onchange = onCatChange;107})();108</script>109 110			<?php111			wp_print_inline_script_tag( wp_remove_surrounding_empty_script_tags( ob_get_clean() ) );112		} else {113			$format = current_theme_supports( 'html5', 'navigation-widgets' ) ? 'html5' : 'xhtml';114 115			/** This filter is documented in wp-includes/widgets/class-wp-nav-menu-widget.php */116			$format = apply_filters( 'navigation_widgets_format', $format );117 118			if ( 'html5' === $format ) {119				// The title may be filtered: Strip out HTML and make sure the aria-label is never empty.120				$title      = trim( strip_tags( $title ) );121				$aria_label = $title ? $title : $default_title;122				echo '<nav aria-label="' . esc_attr( $aria_label ) . '">';123			}124			?>